That would help movement between pages in a single-page application, though cold boot times will still be less than desirable. If I immediately go to the SPA, a

That would help movement between pages in a single-page application, though cold boot times will still be less than desirable. If I immediately go to the SPA, and then navigate from page A to page B and the prefetching hasn't completed yet, it can be a jarring experience. I've occasionally clicked on the wrong thing in a UI because the website repainted as I clicked, causing the DOM to shuffle around considerably. New Reddit seems to be a good example of this problem today.